US5441086A - Gripper shuttle for a loom - Google Patents

Gripper shuttle for a loom Download PDF

Info

Publication number
US5441086A
US5441086A US08/178,700 US17870094A US5441086A US 5441086 A US5441086 A US 5441086A US 17870094 A US17870094 A US 17870094A US 5441086 A US5441086 A US 5441086A
Authority
US
United States
Prior art keywords
clamp
clamp arms
insert body
weft yarn
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/178,700
Inventor
Daniel Nanni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RUETI SULZER
Itema Switzerland Ltd
Original Assignee
Sultex AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sultex AG filed Critical Sultex AG
Assigned to RUETI, SULZER reassignment RUETI, SULZER ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAENNI, DANIEL
Application granted granted Critical
Publication of US5441086A publication Critical patent/US5441086A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D03J5/06—Dummy shuttles; Gripper shuttles

Definitions

  • the present invention is concerned with a gripper shuttle.
  • This inserted elastic material includes edges bearing on the clamp arms to avoid oscillations in the opposed jaws of the shuttle resulting in weft yarn loss from the shuttle.
  • the weft yarn clamp on the yoke is connected rigidly to the housing by rivets or the weft yarn clamp is connected to the housing non-rigidly via a spring body arranged in the yoke.
  • insert bodies of elastic material are arranged between the arms of the clamp and/or between the weft yarn clamp and the housing.
  • a gripper projectile for a loom which prevents oscillations from being transmitted to its yarn clamp through jolts and jerks acting upon the projectile during weft insertion. These oscillations are dampened from transmission by a gripper projectile construction which includes a housing (1) made as a hollow body, a weft yarn clamp (2) which is arranged to fit into the housing and at least one connector element (4) which connects the housing (1) and the weft yarn clamp (2) together.
  • the weft yarn clamp consists of a pair of clamp arms (5) prestressed with springy elasticity and a yoke (6) which connects the pair of clamp arms.
  • An insert body (3) of elastic material is inserted between the clamp arms (5).
  • the insert body (3) exhibits a sawtooth like profiling which is formed at the edge faces in such a way that the individual portions (12) of the profile rest with deformation against the insides of the clamp arms (5).
  • Perforations are disclosed formed of rows of perforations in such a way that the edge faces rest with deformation of the penetrations against the insides of the clamp arms (5).
  • the perforations can extend across or parallel to the length of the clamp arms.
  • the invention intends to create a remedy.
  • the invention solves the problem of the oscillations generated during the weft yarn insertion process through the jolts and jerks which occur on the weft yarn. These oscillations are largely avoided by the insert body resting via the sawtoothlike profiling on the arms of the weft yarn clamp and/or penetrations into the insert body on the one hand and by the connector elements on the other.
  • the advantages which may be achieved by the invention are essentially to be seen in the improved connector elements.
  • These connector elements may be ejected by a suitable tool.
  • the connector elements have a short longitudinal extent in order to consequently prevent damage of the plastic insert. Further, setting of the clamping gap and of the clamping force of the yearn clamp is possible over a wide range. Through the inventive profiled construction of the insert body, a greater range of tolerance thereby of setting the gap and force become possible.
  • the profiling exhibits a tooth height which decreases continuously to the free end of the insert body.
  • FIG. 1 illustrates a preferred embodiment of a gripper projectile in accordance with the invention, represented in partial section;
  • FIG. 2 illustrates a view of a weft yarn clamp and an insert body before the latter has been inserted
  • FIG. 3 illustrates a view of the profiled portion on a larger scale
  • FIG. 4 illustrates a perspective of another embodiment of an insert body in accordance with the invention.
  • FIG. 5 illustrates a view of a further embodiment of an insert body in accordance with the invention.
  • the gripper projectile comprises a housing 1 which is made as a hollow body, a weft yarn clamp 2 which is arranged in the housing, an insert body 3 and two connector elements 4 which connect the housing to the weft yarn clamp.
  • the weft yarn clamp 2 consists of a pair of prestressed elastic clamp arms 5 and a yoke 6 connecting them. At the free ends of the arms 5 are formed portions 7 directed respectively inwards, which form clamp cheeks for a weft yarn.
  • the weft yarn clamp 2 arranged in the housing 1 is fastened to the housing 1 by means of two members 4 like pins. For doing this drilled holes 8 are provided which pass through the side walls of the housing 1 and the yoke 6 of the weft yarn clamp 2 respectively.
  • the members 4 have a circular cross-section and consist of fiber-reinforced plastics, e.g., carbon-fiber-reinforced polyetheretherketone (PEEK) or rectified plastics.
  • PEEK polyetheretherketone
  • the fiber-reinforcement is aligned in the direction axial to the member 4, whereby expansion of the member in the axial direction is prevented.
  • the drilled holes passing through and the member are so designed that the latter is connected to the housing 1 and the weft yarn clamp 2 with a press fit and at its endfaces is essentially flush with the surfaces of the housing 1.
  • the fiber reinforcement can be chosen from the group including carbon, metal, cotton, linen, etc.
  • connection so designed may be released again by the member being driven out by means of a suitable tool.
  • the insert body 3 has a contour which is adapted essentially to the space existing between the arms of the clamp.
  • the insert body 3 has a first portion 10 which fits into the fork between the elastic clamp arms 5 of the weft yarn clamp 2, and adjoining the first portion a second portion 11 which, starting from the first portion 10, tapers in towards the free end.
  • the insert body 3 consists of an elastically yielding material, e.g., of polyurethane.
  • the insert body 3 is arranged between the arms of the clamp in such a way that starting from the fork it extends over a predetermined length of the arms. At opposite edge faces the insert body 3 exhibits a sawtoothlike profiling.
  • the profiled portions have the same tooth height and are directed the same way and formed in the direction transverse to the edge faces.
  • the profiled portions 12 have an asymmetrical trapezoidal shape with one rising flank 13 and one steeply falling flank 14. It proves advantageous if the angle of rise a lies in the range from 30° to 60°. Besides this preferred embodiment the profile portion 12 may exhibit an asymmetrial triangular shape.
  • the insert body 3 has a width which is greater than the distance between the arms of the clamp, so that the profiled portions rest with deformation against the inner faces of the arms of the clamp (FIG. 3).
  • the deformation leads to bending of the free ends of the profiled portions 12a, so that besides the damping which may be achieved through the inner friction a spring action is achieved.
  • the profiled portions 12 are made in the direction longitudinal to the edge faces, e.g., two profiled portions being provided on the edge faces.
  • FIG. 5 showns an insert body 3 which is provided with a perforation which is formed of three rows of holes 15 passing through, the said holes 15 being arranged at intervals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

A gripper projectile for a loom includes a housing (1) made as a hollow body, a weft yarn clamp (2) which is arranged to fit into the housing and at least one connector element (4) which connects the housing (1) and the weft yarn clamp (2) together. The weft yarn clamp consists of a pair of clamp arms (5) prestressed with springy elasticity and a yoke (6) which connects the pair of clamp arms. An insert body (3) of elastic material is inserted between the clamp arms (5). The insert body (3) exhibits a sawtooth like profiling which is formed at its edge faces in such a way that the individual portions (12) of the profile rest with deformation against the insides of the clamp arms (5). The insert body can also be formed with rows of perforations which further enable its edges to deform against the insides of the clamp arms. The perforations can extend across or be parallel to the length of the clamp arms.

Description

The present invention is concerned with a gripper shuttle.
More particularly, between clamp arms actuating the opposed jaws of the shuttle there is disclosed the insertion of elastic material. This inserted elastic material includes edges bearing on the clamp arms to avoid oscillations in the opposed jaws of the shuttle resulting in weft yarn loss from the shuttle.
BACKGROUND OF THE INVENTION
In the case of the known projectiles the weft yarn clamp on the yoke is connected rigidly to the housing by rivets or the weft yarn clamp is connected to the housing non-rigidly via a spring body arranged in the yoke. In the case of both executions insert bodies of elastic material are arranged between the arms of the clamp and/or between the weft yarn clamp and the housing.
By these measures the jerks which act upon the projectile during the weft yarn insertion process are transmitted to the weft yarn clamp damped and consequently the excitation of oscillation is moderated. Although the frequency of loss of the yarn is thereby reduced, the oscillations occurring as before impair the function of the weft yarn clamp because the bouncing together and/or chafing of the clamp cheeks caused by the oscillations still occur.
SUMMARY OF THE INVENTION
A gripper projectile for a loom is set forth which prevents oscillations from being transmitted to its yarn clamp through jolts and jerks acting upon the projectile during weft insertion. These oscillations are dampened from transmission by a gripper projectile construction which includes a housing (1) made as a hollow body, a weft yarn clamp (2) which is arranged to fit into the housing and at least one connector element (4) which connects the housing (1) and the weft yarn clamp (2) together. The weft yarn clamp consists of a pair of clamp arms (5) prestressed with springy elasticity and a yoke (6) which connects the pair of clamp arms. An insert body (3) of elastic material is inserted between the clamp arms (5). The insert body (3) exhibits a sawtooth like profiling which is formed at the edge faces in such a way that the individual portions (12) of the profile rest with deformation against the insides of the clamp arms (5). Perforations are disclosed formed of rows of perforations in such a way that the edge faces rest with deformation of the penetrations against the insides of the clamp arms (5). The perforations can extend across or parallel to the length of the clamp arms.
Here the invention intends to create a remedy. The invention solves the problem of the oscillations generated during the weft yarn insertion process through the jolts and jerks which occur on the weft yarn. These oscillations are largely avoided by the insert body resting via the sawtoothlike profiling on the arms of the weft yarn clamp and/or penetrations into the insert body on the one hand and by the connector elements on the other.
The advantages which may be achieved by the invention are essentially to be seen in the improved connector elements. These connector elements may be ejected by a suitable tool. The connector elements have a short longitudinal extent in order to consequently prevent damage of the plastic insert. Further, setting of the clamping gap and of the clamping force of the yearn clamp is possible over a wide range. Through the inventive profiled construction of the insert body, a greater range of tolerance thereby of setting the gap and force become possible.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to take better into account the alteration in the distance between the arms of the clamp caused during this setting, it may be of advantage if the profiling exhibits a tooth height which decreases continuously to the free end of the insert body.
The invention is explained below with the aid of the attached drawing. There is shown in:
FIG. 1 illustrates a preferred embodiment of a gripper projectile in accordance with the invention, represented in partial section;
FIG. 2 illustrates a view of a weft yarn clamp and an insert body before the latter has been inserted;
FIG. 3 illustrates a view of the profiled portion on a larger scale;
FIG. 4 illustrates a perspective of another embodiment of an insert body in accordance with the invention; and
FIG. 5 illustrates a view of a further embodiment of an insert body in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The gripper projectile comprises a housing 1 which is made as a hollow body, a weft yarn clamp 2 which is arranged in the housing, an insert body 3 and two connector elements 4 which connect the housing to the weft yarn clamp.
The weft yarn clamp 2 consists of a pair of prestressed elastic clamp arms 5 and a yoke 6 connecting them. At the free ends of the arms 5 are formed portions 7 directed respectively inwards, which form clamp cheeks for a weft yarn.
The weft yarn clamp 2 arranged in the housing 1 is fastened to the housing 1 by means of two members 4 like pins. For doing this drilled holes 8 are provided which pass through the side walls of the housing 1 and the yoke 6 of the weft yarn clamp 2 respectively.
The members 4 have a circular cross-section and consist of fiber-reinforced plastics, e.g., carbon-fiber-reinforced polyetheretherketone (PEEK) or rectified plastics. The fiber-reinforcement is aligned in the direction axial to the member 4, whereby expansion of the member in the axial direction is prevented. The drilled holes passing through and the member are so designed that the latter is connected to the housing 1 and the weft yarn clamp 2 with a press fit and at its endfaces is essentially flush with the surfaces of the housing 1. The fiber reinforcement can be chosen from the group including carbon, metal, cotton, linen, etc.
The connection so designed may be released again by the member being driven out by means of a suitable tool.
The insert body 3 has a contour which is adapted essentially to the space existing between the arms of the clamp. The insert body 3 has a first portion 10 which fits into the fork between the elastic clamp arms 5 of the weft yarn clamp 2, and adjoining the first portion a second portion 11 which, starting from the first portion 10, tapers in towards the free end. The insert body 3 consists of an elastically yielding material, e.g., of polyurethane.
The insert body 3 is arranged between the arms of the clamp in such a way that starting from the fork it extends over a predetermined length of the arms. At opposite edge faces the insert body 3 exhibits a sawtoothlike profiling. The profiled portions have the same tooth height and are directed the same way and formed in the direction transverse to the edge faces.
Shoulders 15 rest against recesses 16 in the housing in order, e.g., to prevent longitudinal shifting of the insert.
In FIG. 3 are shown the profiled portions formed on the insert body 3. The profiled portions 12 have an asymmetrical trapezoidal shape with one rising flank 13 and one steeply falling flank 14. It proves advantageous if the angle of rise a lies in the range from 30° to 60°. Besides this preferred embodiment the profile portion 12 may exhibit an asymmetrial triangular shape.
The insert body 3 has a width which is greater than the distance between the arms of the clamp, so that the profiled portions rest with deformation against the inner faces of the arms of the clamp (FIG. 3). The deformation leads to bending of the free ends of the profiled portions 12a, so that besides the damping which may be achieved through the inner friction a spring action is achieved.
The deformation occurs essentially at the profiled portion. A good contact is thereby guaranteed in an advantageous way between the insert body and the arms of the clamp even in the case of greater tolerances in production, and consequently a good positive connection is achieved between the insert body 3 and the arms of the clamp.
In the case of the embodiment shown in FIG. 4 the profiled portions 12 are made in the direction longitudinal to the edge faces, e.g., two profiled portions being provided on the edge faces.
FIG. 5 showns an insert body 3 which is provided with a perforation which is formed of three rows of holes 15 passing through, the said holes 15 being arranged at intervals.

Claims (12)

What is claimed is:
1. A gripper projectile for a loom, having:
a housing made as a hollow body,
a weft yarn clamp which is arranged in the housing and includes a pair of clamp arms extending in a longitudinal direction prestressed with elasticity towards one another through a yoke which connects the clamp arms;
an insert body of elastic material inserted between the clamp arms and confronting the clamp arms at [an]inside edge faces thereof, and
at least one connector element which connects the housing and the weft yarn clamp together, the improvement to the insert body including:
the insert body of elastic material has individual sawteeth forming a sawtooth like profile at the inside edge faces confronting the clamp arms;
the sawtooth like profile resting with the individual sawteeth having deformation against the inside edge faces of the clamp arms.
2. A gripper projectile for a loom according to claim 1 and wherein:
the sawtooth like profile is arranged across the longitudinal direction of the clamp arms.
3. A gripper projectile for a loom according to claim 1 and wherein:
the sawtooth like profile is arranged in the longitudinal direction of the clamp arms.
4. A gripper projectile for a loom according to claim 1 and wherein:
the insert body consists of an elastomer.
5. A gripper projectile for a loom according to claim 1 and wherein:
the insert body exhibits a profile with a saw tooth height which decreases continuously towards the weft yarn clamp.
6. A gripper projectile for a loom according to claim 1 and wherein:
the connector element is a pin which consists of plastics reinforced with reinforcing fibers.
7. A gripper projectile for a loom according to claim 6 and wherein:
the fiber reinforcement runs in the direction axial to the connector element.
8. A gripper projectile for a loom according to claim 6 and wherein:
the fiber reinforcement consists of fibers chosen from the group consisting of carbon, metal, cotton, and linen.
9. A gripper projectile for a loom according to claim 6 and wherein:
the connector element consists of polyetheretherketone.
10. A gripper projectile for a loom, comprising:
a housing made as a hollow body;
a weft yarn clamp which is arranged in the housing and includes a pair of clamp arms extending in a longitudinal direction prestressed with elasticity towards one another through a yoke which connects the clamp arms;
an insert body of elastic material inserted between the clamp arms and confronting the clamp arms at [an]inside edge faces thereof;
at least one connector element which connects the housing and the weft yarn clamp together;
the insert body of elastic material has individual sawteeth forming a sawtooth like profile at the inside edge faces confronting the clamp arms;
the sawtooth like profile resting with the individual sawteeth having deformation against the inside edge faces of the clamp arms; and,
the connector element is a pin which consists of plastics reinforced with reinforcing fibers.
11. A gripper projectile for a loom according to claim 6 and wherein:
the fiber reinforcement runs in the direction axial to the connector element.
12. A gripper projectile for a loom according to claim 6 and wherein:
the connector element consists of polyetheretherketone.
US08/178,700 1993-02-18 1994-01-10 Gripper shuttle for a loom Expired - Fee Related US5441086A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4305030A DE4305030A1 (en) 1993-02-18 1993-02-18 Gripper projectile for a weaving machine
DE4305030.1 1993-02-18

Publications (1)

Publication Number Publication Date
US5441086A true US5441086A (en) 1995-08-15

Family

ID=6480806

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/178,700 Expired - Fee Related US5441086A (en) 1993-02-18 1994-01-10 Gripper shuttle for a loom

Country Status (2)

Country Link
US (1) US5441086A (en)
DE (1) DE4305030A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6089281A (en) * 1999-04-15 2000-07-18 Precision Research & Development, Inc. Strand gripper and method
US6092561A (en) * 1998-03-05 2000-07-25 Sulzer Rueti Ag Thread clamp for a weaving machine and a weaving machine with a thread clamp of this kind
US6167918B1 (en) * 1995-05-04 2001-01-02 Picanol N.V. Gripper system for gripper loom
CN116516553A (en) * 2023-03-27 2023-08-01 武汉纺织大学 Weft insertion speed controllable broad-width gripper loom and control method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111350012B (en) * 2020-04-24 2021-04-16 扬州市郭氏精密机械制造有限公司 Forcing device and forcing method for gripper shuttle yarn clamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712345A (en) * 1970-05-29 1973-01-23 Sulzer Ag Yarn clamping mechanism
US3853152A (en) * 1972-07-10 1974-12-10 Sulzer Ag Gripper shuttle for weft threads in a loom
US3854506A (en) * 1972-05-26 1974-12-17 Sulzer Ag Gripper shuttle
SU1379366A1 (en) * 1986-02-26 1988-03-07 Всесоюзный научно-исследовательский институт технических тканей Gripping shuttle for loom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712345A (en) * 1970-05-29 1973-01-23 Sulzer Ag Yarn clamping mechanism
US3854506A (en) * 1972-05-26 1974-12-17 Sulzer Ag Gripper shuttle
US3853152A (en) * 1972-07-10 1974-12-10 Sulzer Ag Gripper shuttle for weft threads in a loom
SU1379366A1 (en) * 1986-02-26 1988-03-07 Всесоюзный научно-исследовательский институт технических тканей Gripping shuttle for loom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6167918B1 (en) * 1995-05-04 2001-01-02 Picanol N.V. Gripper system for gripper loom
US6092561A (en) * 1998-03-05 2000-07-25 Sulzer Rueti Ag Thread clamp for a weaving machine and a weaving machine with a thread clamp of this kind
US6089281A (en) * 1999-04-15 2000-07-18 Precision Research & Development, Inc. Strand gripper and method
CN116516553A (en) * 2023-03-27 2023-08-01 武汉纺织大学 Weft insertion speed controllable broad-width gripper loom and control method thereof

Also Published As

Publication number Publication date
DE4305030A1 (en) 1994-08-25

Similar Documents

Publication Publication Date Title
KR101014549B1 (en) Needle with transfer spring
JP4029083B2 (en) Fence for loom
EP0302798A2 (en) Harness frame slat and heddle
US5441086A (en) Gripper shuttle for a loom
KR20090025138A (en) buckle
KR20150119937A (en) Connecting means
EP1170409A1 (en) Multicomponent cross-piece for low-noise heddle frames in weaving looms
US4741367A (en) Heald frame for looms
EP0659917A2 (en) Heddle frame assembly with releasable end braces
KR200223657Y1 (en) One touch type coupling device for reinforcing rods
US20050011577A1 (en) Heddle frame and weaving loom provided with at least one such frame
JP4067848B2 (en) Corner joint structure of frame
GB2049874A (en) Bar pin for use in torque rods
US4997306A (en) Joint for reinforcing bars
US3965940A (en) Rigid and flexible mounting for reed-dent in a profiled stave
EP0395132B1 (en) Mechanism for mounting a part on the sley of a weaving machine
CN1816654B (en) Heald shaft for a weaving machine
US7281548B2 (en) Weaving heddle
US4120329A (en) Gripper shuttle for picking in weaving machines
US4252153A (en) Heddle rod hook device for a loom
CA1069961A (en) Insert for attaching a tip of an excavator tooth
EP1013806A1 (en) Pair of weft carrying and drawing grippers for weaving looms
US4508146A (en) Gripper projectile for a weaving machine
JP6309207B2 (en) Shaft rod for heald frame with reinforcing rod
US5632309A (en) Gripper projectile for a weaving machine

Legal Events

Date Code Title Description
AS Assignment

Owner name: RUETI, SULZER, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAENNI, DANIEL;REEL/FRAME:006851/0325

Effective date: 19931123

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19990815

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362